JP2549211Y2 - Recording error detecting device in magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a DAT having a reproducing magnetic head used for read-after-write after recording on a magnetic recording medium, for example, for confirming the recording state. (Digital audio tape recorder)
In particular, the present invention relates to a recording error detection device in a magnetic recording / reproducing device capable of detecting a recording error even when overwriting cannot be performed at all.

[Conventional technology]

FIG. 4 is a diagram for explaining signal processing when performing recording / reproduction and read-after-write in a conventional DAT.

In the figure, reference numerals Ha and Hb denote recording / reproducing magnetic heads.
a 'and Hb' indicate a verifying magnetic head used for read-after-write. Reference numeral 20 denotes a head amplifier, which includes a reproduction amplifier 20a and a recording amplifier 20b. The head amplifier 20 is provided in a pair, and one of the head amplifiers 20 has a recording / reproducing magnetic head.
Ha and Hb are connected. In addition, verifying magnetic heads Ha 'and Hb' are connected to the reproducing amplifier 20a of the other head amplifier 20 on the right side of FIG. Reference numeral I denotes an integrated circuit (IC) used for processing a signal based on a magnetic head and recording / reproducing data to / from a read-after-write or a magnetic tape T.
1. A block 22 exclusively for reproduction is formed. Recording / playback block 21 is PCM recording / playback block 21a, RF amplifier
21b and so on. The PCM recording / playback block 21a is provided with a PCM by a system controller (not shown).
The data is sent, where ATF (Automatic Track Followi
ng) A format including data is formed.
The formatted data is amplified by the RF amplifier 21b, sent to the recording amplifier 20b, and recorded on the magnetic tape T by the recording / reproducing magnetic heads Ha and Hb. In the reproducing operation, data read by the recording / reproducing magnetic heads Ha and Hb is sent from the reproducing amplifier 20a to the RF amplifier 21b and amplified, and a predetermined process is performed in the PCM recording / reproducing block 21a. ing.

The read-only block 22 is an error monitor circuit 22a used at the time of read-after-write, an ATF servo circuit 22b for forming a reference signal for detecting whether the magnetic head is correctly tracing the recording track at the time of reproduction,
VC to form a PLL (Phase Locked Loop) control signal
It comprises an O (Voltage Controlled Oscillator) circuit 22c and the like.

In DAT, when erasing a previously recorded signal necessary for recording data by the recording / reproducing magnetic heads Ha and Hb, the previously written signal is erased by the next signal to be written. The light method is adopted. In the read-after-write, the track on which data is recorded by the recording / reproducing magnetic heads Ha, Hb is delayed by one rotation of the rotating head, and the verifying magnetic heads Ha ', Hb are respectively delayed.
This is done by scanning b '. Magnetic head verify Ha ', Hb' C ₁ of the input example PCM signal read by the error monitor circuit 22a (main data)
Error data recorded by checking the code error of the (C ₁ error) is adapted to be monitored, thereby so that the read-after-write is performed.

[Problems to be solved by the invention]

However, conventionally, since so as to monitor only recording error watching C ₁ code error of the PCM portion (C ₁ error), the head grog (head clogging) or the like occurs as described above If overwriting cannot be performed at all, the previously written signal remains without being erased, so even if read-after-write is performed, a recording error is detected as long as the remaining PCM data itself is normal. There was a problem that can not be.

The present invention is intended to solve the above-described problem, and has as its object to provide a recording error detection device in a magnetic recording / reproducing device capable of detecting a recording error even when overwriting cannot be performed at all. .

[Means for solving the problem]

The recording error detecting device in the magnetic recording / reproducing device of the present invention includes a recording signal processing unit for generating recording data by adding different discrimination data for each predetermined amount of main data group, and recording the recording data on a magnetic recording medium. A recording magnetic head, a recording magnetic head for scanning a portion where data is recorded by the recording magnetic head during a recording operation to obtain a read-after-write reproduction output, and recording data provided to the recording magnetic head. The discrimination data in the data and the discrimination data in the reproduction data obtained by scanning the recording position of the recording data by the reproducing magnetic head are compared, and when both data do not match, a recording error detection signal is output. And a discrimination data comparison unit.

[Action]

According to the above-described means, the data recorded on the magnetic recording medium by the recording magnetic head includes different discrimination data for each of a predetermined amount of data groups, and the individual data groups can be distinguished by the discrimination data. It has become. When data is recorded on the magnetic recording medium by the recording magnetic head, that portion is scanned by the read-after-write reproducing magnetic head during the recording operation. Then, by comparing the discrimination data included in the recording data with the discrimination data in the reproduction data obtained from the reproducing magnetic head that scans the recording location of the recording data, the predetermined recording data can be accurately determined. It is possible to detect whether or not the data is recorded during the recording operation. This makes it possible to determine, for example, clogging of the recording magnetic head.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a recording error detecting device in a magnetic recording and reproducing device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes an electromagnetic recording / reproducing system including a recording / reproducing magnetic head, a read-only magnetic head for read-after-write, and a head amplifier, and reference numeral 2 denotes main data such as an audio signal recorded by the recording / reproducing magnetic head. 1 shows a recording signal processing circuit that forms a (PCM data) signal and a subcode data signal and outputs the signal to an electromagnetic recording / reproducing system 1. The recording signal processing circuit 2 transmits discrimination data as subcode data, whose contents change each time the recording / reproducing magnetic head scans the magnetic tape for recording, together with main data and the like. Output to The discrimination data is written by the recording / reproducing magnetic head into, for example, a predetermined portion in a sub data area, and discriminates whether the data is new data recorded this time or data which has been recorded last time and remains unerased data which is not erased this time. Serial data (or a code having an equivalent discrimination function).

The reference numeral 3 monitors the C ₁ code error of (C ₁ errors) in the main data read-after-write by the reproduction-only magnetic head in response to an output of the electromagnetic recording and reproducing system 1, detects the C ₁ error when is a C ₁ error monitor circuit for outputting a recording error detection signal. Numeral 4 denotes the discrimination data as the storage data to be recorded this time from the recording processing circuit 2 and the electromagnetic recording / reproduction system 1.
This is a discrimination data comparison circuit which receives discrimination data as reproduction data obtained by read-after-write this time, and compares both discrimination data, and outputs a recording error detection signal when they do not match.

Next, the operation of this embodiment will be described with reference to FIGS.

First, a case where overwriting by the recording / reproducing magnetic head is normally performed will be described. 2A is a recording track formed by the previous recording operation of the recording / reproducing magnetic head Ha, and FIG. 2B is a recording / reproducing magnetic head.
The recording track formed by the current recording operation of Ha is shown. As shown in FIG. 2 (a), along with the main data (PCM data) D _n, such as audio data in the main area of the recording track by a previous recording operation is recorded, the discrimination data predetermined portion of the sub-area (serial Data) _Sn is recorded. Subsequent current recording operation, as shown in FIG. 2 (b), the previous main data D _n is newly erased main data D _{n + 1} is recorded by overwriting the main area of the recording track . Therefore, in read-after-write after the current recording operation, the determination data _{Sn + 1} is reproduced by the read-only magnetic head Ha '. Therefore, the common discrimination data _{Sn + 1} from the recording signal processing circuit 2 and the electromagnetic recording / reproducing system ₁ is input to the discrimination data comparison circuit 4 in FIG. No error detection signal is output.

Next, the operation of this embodiment when the recording / reproducing magnetic head Ha is clogged and overwriting is not performed at all will be described with reference to FIG.

As shown in FIG. 3 (a), the recording / reproducing magnetic head Ha
Of the preceding printing operation (not yet occur Medzu Mari the recording and reproducing magnetic head Ha in this last recording operation), as sub-code in the sub-area with the main area has a main data D _n is recorded The discrimination data _Sn is recorded. Then the current recording operation by the recording and reproducing magnetic head Ha, main data D _n and discrimination data S _n new main data is erased by overwriting D _{n + 1} and determines the data S _n in the main area and sub-area originally ₊₁ should be recorded, overwriting is not performed for Medzu Mari occurs in the recording and reproducing magnetic head Ha, as shown in FIG. 3 (b), the main data D _n and determine the previously recorded The data _Sn is left as it is. And in read-after-write to be performed by the reproduction-only magnetic head Ha 'immediately after the current recording operation, so that said erasing remaining main data D _n and discrimination data S _n is directly read. And in this case the first
In C ₁ error monitor circuit 3 of FIG, recording error detection signal as long as the main data D _n itself is normal is not output.

On the other hand, in the discrimination data comparison circuit 4 of FIG. 1, the discrimination data S _{n + 1} from the recording signal processing circuit 2 as the recording data to be recorded by the current recording operation.
There will be discrimination data S _n as this read-after-write reproduction data is input from the electromagnetic recording and reproducing system 1 is inputted. Therefore this case is discrimination data S _{n + 1} and the read-after-write discriminant data S _n and mismatch for recording, it is determined that leaving off has occurred, so that the recording error detection signal is output.

As described above, in the present embodiment, the recording signal processing circuit 2 generates discrimination data such as serial data whose contents change each time the recording / reproducing magnetic head scans the magnetic tape for recording as subcode data. During the recording operation, the discrimination data is recorded together with the main data. The discrimination data as the recording data is also output to the discrimination data comparison circuit 4, and the discrimination data comparison circuit 4 compares the discrimination data as the recording data with the discrimination data as read-after-written reproduction data. It is supposed to be. Therefore, according to this embodiment, even if it is impossible to perform overwriting clogging the recording and reproducing magnetic head Ha is generated as a result it can not be recorded error detection by C ₁ code error of the main data, the data This makes it possible to effectively detect a recording error due to the unerased data. In this embodiment, the discrimination data S _n , S
_{Although n + 1} is recorded in the sub-area of the recording track, this discrimination data may be recorded in the main area of the recording track.

〔effect〕

As described above, according to the present invention, in the recording signal processing unit, recording data is generated by adding different discrimination data for each predetermined amount of main data group. Reproduced by the head.
Then, the discrimination data in the recording data is compared with the discrimination data in the reproduction data obtained from the reproducing magnetic head that scans the recording location of the recording data, and when there is no match, a recording error detection signal is output. Is output. Therefore, when overwriting or the like cannot be performed due to clogging of the recording magnetic head or the like, a recording error can be detected accurately and immediately during the recording operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a recording error detecting device in a magnetic recording and reproducing device according to an embodiment of the present invention;
2A and 2B are diagrams for explaining the operation of this embodiment when overwriting is normally performed. FIG. 2A is a recording track formed by the previous recording operation, and FIG. 2B. FIG. 3 is a diagram showing a recording track formed by the current recording operation, and FIG. 3 is a diagram for explaining the operation of the present embodiment when overwriting cannot be performed due to head grog or the like. 3 (b) shows a recording track formed by this recording operation, and FIG. 4 (b) shows a recording / reproduction and read-after-write in a conventional DAT. FIG. 4 is a diagram for explaining signal processing. 1 ... Electromagnetic recording / reproducing system, 2 ... Recording signal processing circuit, 4
... A discrimination data comparison circuit.

Claims (1)

(57) [Scope of request for utility model registration] 1. A recording signal processing unit for generating recording data by adding different discrimination data for each predetermined amount of main data group, a recording magnetic head for recording the recording data on a magnetic recording medium, and the recording A read magnetic head for obtaining a read-after-write read output by scanning a portion where data has been recorded by the read magnetic head during a write operation; the discrimination data in the record data provided to the write magnetic head; A discrimination data comparison unit that compares discrimination data in the reproduction data obtained by scanning the recording position of data with the reproduction magnetic head and outputs a recording error detection signal when both data do not match. Recording error detecting device in magnetic recording / reproducing device characterized by the following: